Well, as I'm an old Yu-Gi-Oh player, I can tell you a little story about Cyber Dragon.
When Cyber Dragon was released it became nearly Staple. During the Worlds (I think it was 2008), the Top 8 players played an amount of 20 Cyber Dragons, and while considering that the maximum number of identical cards you have in Yu-Gi-Oh is three, nearly every Deck played the maximum of it. This is when this card was 20-25 Euros worth, nearly 40 US$ sometimes for 1st ed.
Then he got restricted. And there was also a Promo released, and the price fell down to 10US$ or even less. Then, a new type of cards was released, the Synchros, and while CD (Cyber Dragon) was a very essential card in Monarch Decks, the whole Monarch strategy crashed and so did CD. Now he's worth just a couple of Dollars, for the "very shiny" one, if it's card number is CVR-EN015, it's worth about 10 US$, some collectors might consider to pay more. Just as a clarification what the card number says:
CRV = Cybernetic Revolution
EN = English
015 = 15th card of the set.
I might be interested a bit, maybe if you could trade them for LotR cards, but I won't consider buying them. They are really useless in the current Meta.